1324256640 has 256 divisors, whose sum is σ = 4956318720. Its totient is φ = 294395904.

The previous prime is 1324256639. The next prime is 1324256653. The reversal of 1324256640 is 466524231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 495949 + ... + 498611.

It is an arithmetic number, because the mean of its divisors is an integer number (19360620).

Almost surely, 2^1324256640 is an apocalyptic number.

1324256640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1324256640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2478159360).

1324256640 is an abundant number, since it is smaller than the sum of its proper divisors (3632062080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1324256640 is a wasteful number, since it uses less digits than its factorization.

1324256640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729 (or 2717 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 1324256640 is about 36390.3371789820. The cubic root of 1324256640 is about 1098.1391789758.

The spelling of 1324256640 in words is "one billion, three hundred twenty-four million, two hundred fifty-six thousand, six hundred forty".